Concrete structure.



C. B. GRADY.

GONGRETB STRUCTURE.' APPLICATION FILED APBJS, 190B. 1,102,580, v Patented July 7, 1914,

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by gswowffmwmg C. B. GRADY.

CONCRETE STRUCTURE.

.APPMUATION FILED Arms, 19084 Patented July?, 1914J 2 SHEETS-SHEET Z.

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CHARLES BENEDICT GRADY, OF WEST ORANGE, NEW JERSEY.

CONGTE STRUCTURE.

Specification of Letters Patent.

Fatented July wird.

Applicationled April- 13, 1908. Serial No. 426,669.

To all whom t may concern;

Be it known that L @Hannes Bnnnnror GRADY, a citizen of the United States, whose residence andv post-.oiiice address fisI West Grange, county of Essex, State ot New Jersey, have invented certain new and useful Improvements in Concrete Structures, ot which the following is a specification.

My invention relates to concrete structures, and more especially to concrete-andmetal floor girders; to concreteand-metal loor slabs; to the relative arrangement of said girders and slabs and the means of interconnecting` them.

li will iirst describe a form ot`concrete structure embodying my invention, and then point out the novel eatures in the claims.

ln the accompanying drawings, Figure l is a. vertical cross section through a floor girder and also through two ieor slabs connected to said girder on either' side, said gil-der and slabs embodying` features of my invention, and said section being taken on the plane 1-1 of Fig. 2. Fig. 2 is a top view ot the structure shown in Fig. 1, with the floor slab at the left, however, omitted. Fig; 3 is an isometric View of one end ot the metal part ot the slab ot Figs. l and 2, the concrete being omitted., Fig. e is a vertical cross section taken at right-angles to that shown in Fig. l; the lei't hand side of Fig. 4 showing the identical construction of Figs. 1, 2 and 3,v while the right hand portion of Fig.- t shows a modification. Fig 5 is a view similar to Fig. l, but indicating modified means of assemblage or connection between the Hoor slab and girder. Fig. is an isometric view similar to Fig. 3, but showing a modification in the arrangement ot the metal skeleton embedded in ythe concrete. Fig. 7 is a section on 7, Fig. 5.

Similar letters of reference designate corresponding parts in the several figures of the drawings.

Referring to Figs, l, 2 and 3, and the left side of Fig. 4, showing the main form. of my invention, the 'girder appears as consisting of a standard metallic shape A for extending from column to column, and concrete o embedding said shape A, with some metal left exposed as will hereinafter be explained. Each floor slab is intended to extend froml girder to girder, and thus dispense with the usual Hoor beams; and each slab consists of a concrete mass B embedding a metallic frame, the metal projecting in such way as to be readily secured to the girden 'lhe upper corners of the slabs are to be attached preferably by'bolts or similar metallic means at the top or upper side of the girder, and the lower corners ci the slabs, while not necessarily attached by metallic means, are to be seated on specially formed projections of the girder. To these ends my girder has metallic attaching means at its top such as metal clips or ann gle-irons C secured thereto, with which the slab securingv bolts c engage.

rFhe metallic shape A isl shown as an upright -beam, and asA one way of `providing a seat for the lower corner of the slab l torni the concrete mass c extending vertically from the top downwardly until near the lower end it is enlarged or projected laterally, as seen in Fig. l, forming a sort ot( inverted T in cross section. Combined with the concrete projection is a metal seat D, there being one on each side, and a cross bolt, such as the bent bolt cl, engages the seats, strengthening their connection with the concrete a', and ilfbeam A.

The slanting* side of the metal seat D is for coaction with a corresponding bevel formed at D at the lower corner of the Hoor slab. '.llhe mere depositing of D in D in the process of erection forms a secure seat, in tact a very rigid union, and one which notl only prevents the slab separating from the girder at the bottom, but precludes the twisting ot a girder which sometimes occurs, with bad results, durino4 erection. The seat D preferably consistso? an angle iron with both legs pointing upwardly, thus forming a pocket' :tor receiving part of a slab, for example, the bottom portion of the end member F of the metallic structure embedded in the slab. As shown .in Figs, 1 and 2, the cross bolt d extends from seat D, upwardly and inwardly toward the center of the irderiand en ages the metal port-ion of sai ginder, `and t us said bolt d transfers a portion of the load imposed on seat D to the Ymetal of the girder.

The metal work of the slab may be varied, but thatl shown in Fig. 3. is effective when the slab has a top part and two ribs b (Fig. 4 bililt-up frame having a bottom member E for each downwardly projecting concrete rib b; an end member F which 'connects with the girder and is shown as consisting of a pair of angle-irons; a reinforcing bar G.

near the top of the slab; and two vertical plates I-I, shown trapezoidal in form, one at each end, to which members E, F and Gr are bolted or attached. Additionally, the slab vconcrete is shown as embedding a series of horizontal rods I which pass through holes in bars G, and at their ends may connect with corresponding rods I in the next slab. Also a series of vertical rods J which help reinforce the concrete ribs b, and which are preferably formed U-shape, and embrace the i members E and Gr. rIhe metallic members F and 3, K represents furring rods,l see also left hand of Fig. 4. Ordinarily in making plastered ceilings, a series of furrng strips are attached to the bottom of floor beams by wires or clamps, laths being then secured to the strips and plaster applied against the laths. In my newpreformed slab, however', the furring strips K are attached in the process of manufacture so as to extend from rib b to the next rib, and suiiiciently beyond. I' preferably use U-rods for securely holding the strips K, and in fact, the same U- rods J already described which reinforce the concrete rib or web of the floor slab. Passing to the right of Fig. 4, the strips K willl be seen to be embedded in concrete at 7c, thus carrying further forward the ideas already described. The method of manufacturing this slab will be to cast the concrete in suitable molds, or between boards, and the hollow interior can be produced by almockdown box arrangement removable after the concrete is hardened. Important features in my mode of manufacturingv these slabs are (l) the inverted position of the slab during manufacture, and (2) the indenting, scratching or otherwise roughening the upper surface (to become the lower surface when in place) by a roller or abradinof tool, at a stage when the concrete is still green, or not completely set, thus 'giving a surface to which plaster will directly adhere, and with This metal work consists of a stro-ng 4formed on the applying grease to permit the separation of concrete and form.

In-the modification of Fig. 5, the seat 'rder is not metal lined nor with inclined sides, but is preferably reinfo-rced by a rod L, whose ends Z may project up and engage in the concrete of the slab, or within the angles of the members F of the slab. Also the bolt c at the top for securing the slabsis replaced bytwo small bolts 0', c', each connecting one slab'with an angle-iron C. Also the slab reinforcement is as shown in Fig. '6.

Fig. 6 indicates how the trapezoidal plate II may be dispensed with, by connecting the bars E and G 'directly with the member F. The modifications of Figs. `5 and 6 are only preferable Where the load is. comparatively light.

What I claim and desire -to secure by Letters Patent is:

1. A ioor comprising opposite girders, concrete slabs set between said girders, each slab having embedded therein at least one metallic structure, each of said metallic structures comprising an end member as F secured to said girders, a horizontal tension member as E and plates as ,I-I'connecting members E and F together.

2. A floor comprising opposite girders, concrete slabs set between said girders, each slab having embedded therein at least one metallic structure, each of said metallic structures comprising an end member as F secured to said girders, a horizontal tension member as E .and plates as H connecting members E and F together, and a depending concrete rib inclosing the lower portion of each metallic structure.

3. A floor lcomprising opposite girders, concrete slabs set between said girders, each slab having embedded therein at least one metallic structure, each of said metallic structures comprising an end member as F, enga-gingy said girders, 'a horizontal tension member as E, -and a horizontal top member as G placed above and parallel to E, andbolts fastening members E, F andI G vtogether.

4. A floor comprising opposite girders, concrete slabs set between said girders, each slab having embedded therein at least one metallic structure, each of said metallic lstructures comprising an end member as F, engaging said girders, a horizontal tension member as E, and a horizontal top member as Gr placed above and parallel to E, and means for fastening members E, F and G together, and a depending concrete rib inclosing the lower portion of each metallic structure.

5. A floorcomprising opposite girders,.

metallic struct-ure, each of said metallic structures comprising an end member as F, engaging Said girders, a horizontal tension member as E, a horizontal top member as Gr placed above and parallel to E and plates as H connecting members E, F and G together.

In testimony whereof, have hereunto set my hand this 10th day of April, 1908.

CHARLES BENEDCT GRADY.

Witnesses:

OLIVE B. KING, CHARLES A. HOWARD. 

